Support ARM with pre-build packages

[sebastianohl]

Hello there,

I would like to use mig-parted on a GraceHopper ARM64 system. Unfortuanally, there is no prebuild package that can be installed out of the box. I build the ubuntu20.04 package myself and it looks that it works as expected. Having packages that simply can be downloaded would be much easier.

Regards
Sebastian

[elezar]

We have just started reworking our package builds in #42 and should be able to provide ARM packages following this.